The Holmes Inheritance by Brian Freemantle

Is this the new Sherlock Holmes? Not only did Sherlock Holmes survive the Reichenbach Falls, but he has a son, Sebastian, itching to prove himself his father's equal. The opportunity arises in the run up to the First World War, when cabals of US businessmen plan to exploit their country's neutrality by selling arms to both sides. Sebastian must infiltrate these circles . . . a task that proves both complex and fearsomely dangerous.